SSL error with When adding apt

[Hadidi-007]

Hey i m having an issue building my android application on travis due to an ssl error when getting the source of apt addons plugin:
the error is :
$ sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
Error reading /ubuntu-toolchain-r/test/ubuntu: server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
and then the build fails cause "apt-get install failed"
i want to know when this issue is going to be resolved or if there is any other source i can use.
I tried deadsnakes and same issue was found.